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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ddc6b5254939dc1edbfdff596df7da7d2b1b086c3958441d97b26085bb21a0' 
  AND token = '3czZ9Ck29THKc22pNIBOUWZoAR2NMs6I2nq3ajDQBwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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