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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f74923191e31df51316bfe549a0ba5d553b87691d7c499df2f10122820efd9' 
  AND token = 'MoWLTHMctghkTBQDCXm7W3Vds+Q75FuUvb1YxyJBSlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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