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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d0d07d97b6a52bfec2d548f8680e441253051f85cd829287ba78052bd0a256' 
  AND token = 'Iy+3Xq0181LGbBTYzFkhx1S9IHq7BFcelQFOBbuxM9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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