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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672cefb7b340e98ef8a9b46483d7f1adfc57429046d78378a21304627e65348a' 
  AND token = 'lnuWjHKfoENlK5NgtXDcGuW36s4jbS2kjAymzRywwU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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