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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba2a6e67bdc8c61beafa4aa2e7ab05fd1b65de66199d0c9093cda1edb23d0d6' 
  AND token = '2cIMVt+cnbgXniHSebhfACpFpzkmR4/bXWPaMgUsvn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00799

JSON explain

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