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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9855b751024880f4f163ada74d7ef982c58307c481d2e72802eb7db5d319d52' 
  AND token = 'QAm1q2Pw8A3I44pukY3ZBqUNzFamEJBlune4zpx0Ar8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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