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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b5ecebcdf33eae1794a6e72ab576711f5cea2097f54ff38b3444a47f10c56b' 
  AND token = 'FfYd0bEhSJPpxXlSwTr1qinYNk9ibRRO9vfTYZ1R2WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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