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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5235d8cb1a5f4a936e0863aef9fbb6684694854c20a57f046ad72a027c01d88e' 
  AND token = 'kzwpILQqiK9s9fhjW7yVssccZvjNE1Ap3tRaaVc/y+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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