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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320910bdbca3f8660e22ccc334d1a71bf6dbc0dd07103f4c4d0efb242496d131' 
  AND token = 'pA7Dq5jYsGJvWavQ9yGnqO6whrjgx4av9LDAnaFSO1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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