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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6940031e16c9fc6f4cba697983b432c9d5638939c63747c614dd195046415a' 
  AND token = '5G2JqOjFWBAkbZJjo4axSGk1Dvg063m8lBmMqqGg1Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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