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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6468676a4b6ea37202ff2942ab2c9028f04687c26b3b20d8e1859cc3484fc4da' 
  AND token = 'qZ4wE/H3Iy2CLm86Plx/sQNle9umXl7sTKA815n0Xm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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