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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c51025b08a3586ceb04d9b3f601c0aad4108375aa41e22f0449704ddc99d0d3' 
  AND token = 'YgeSzHsCnC9fUW8Ek3hQ5atYUhVjRdwwdPA6kxyz4P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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