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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b21d596ca2d9ba81b8158f431262cda9b930f697ae810689e124cda7344c7e3' 
  AND token = 'qr/79DY3P9/0fslEGpCp4qh//F0Yo1rSQFWIRfiFT3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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