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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3611ce964eaf71742058993ecec153a3f98e95dc9b3306b02996e2910bc0d19b' 
  AND token = 'D/39YwCYwQGxn9DUcscD1++WfE37qyTX8CvNCWcapuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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