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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e23b7ce8459812b959183753d3a0aae41664c4a80d70c903c516946483f99b1' 
  AND token = 'dBGBH5u85/JUf2JJPyProMionaigTb7oSmZ+fUPZ3Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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