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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991bc9dce7510196e77ae5c36cae426eecb4b14c874d927ec2234771d11711d1' 
  AND token = '23jgyZbwUkFy4JHJyZSmRef+U7UEAexm9kGRbRLFC9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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