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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9e4a832186818cb4000df5c86f10685dfb6a5a0c84c4d087dc6cd1f3fac871' 
  AND token = 'muSOCOceMYr410IrDlnoIb5LnNkcX+kiC8Hi4E+g1Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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