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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7d6fbacf83d04931abcc925162a330f92a5e63c9c16c82d5ac5542d8577964' 
  AND token = 'KK3P9lP4h7oQJLCg0r1V1drrHA2UIekMyLzd6RlF7bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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