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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6dfe7985865b9e60c20c1498e2506d710da68f5a53c9795d6c791ca05cad60' 
  AND token = '95Z4YJuKkNqyVorNt+jHNgNI7AQcz5Qi/CZA+1nBG5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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