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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd0b0cff2d1ebdd7ac3283942b76daefb7204fa9c47aa319292c2ca198e635c' 
  AND token = 'eaT54HFLq9q1GnrIgrIlM2o8VtB6HZsh4ivzVpsGaiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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