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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc9c43c0de1399a37ccce39a89c4097830d430747b1a6cfd8782f9b3c284054' 
  AND token = 's/bjKRflkQ2mcG+CJ3vIDGmcVMtrFGP7mU9taimkWX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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