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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d4de38781db0de2c93a3a67b02b6513a111481d0d22f52a8f00235eb1de704' 
  AND token = 'kvpTl/dgxgaXnsPa0ClMUygQCfc1rxNSDK+RSdyEi1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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