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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e87ec2940bf1854e5c1090727993dbeb6397456e7b96bccefb3f9a19769b7d7' 
  AND token = 'P2TSv/VSfrvJDzQS+bV/jHpu9ADtoms2ASajIFWjuGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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