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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ce583d093588f2b1d17ed8e6981bffcd6847f5c8f25d7a69cebb64eb43833a' 
  AND token = '3rllZl8PGkXXGUKo8omo5OOnB3M/kPQsdrffXO+59xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00592

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}