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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abccca2ce8cf4d5088d1dd250cfbdcf35a46ebff1b4a4174304701e424dfd909' 
  AND token = '5eXbS/AbXMVMGVdogdJdrBluJWmgjhTiZ4KFwCQygvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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