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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c447119ea6245e1ef2d1990a348d0e6b166258e80eeef38723c12683bc0ab220' 
  AND token = 'kLm6p6NpLNnxGBTuKJpeSAc6gXQibchkoOx+k2JtI+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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