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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dee8ff346ee3a26a2344731b6fc5f5b03dbfa46ec1407de17bcb833752c89a' 
  AND token = '57BHPmKvwv1rQ0gsDw6luL3Qvbqq8N3eLM8Y0u3ZL/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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