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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4d089e414e59d031519bbdcf36a9e924daba95434ef0d8945c835f68dc308c' 
  AND token = 'xOAbYZ1zKxG5ghRzcpH+bPzdXWhPHajBALWwBzEFwNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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