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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952dfe8137dd6f3dbccd585cd892b0fcc20bd0de29835ebb9d4031c6c5a0cd52' 
  AND token = 'AoZUY4SSNC1Ct3UN3z7mqGh3hB/HmnUmCLqPTXo8pS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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