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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8174abce8db462904057678ace5c379a8813dbedd6b980d15d86aa3844897ee4' 
  AND token = 'J1mU7FbrGM/8FYiw3cKAlY42S22zW7nTXU9R16pCbz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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