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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b40c078b05697267e2599c3d282535a0fa56211d8c8cdd88a6137300bffe1e6' 
  AND token = 'bHZeNwqxFsD6mzXhAHsac3sv6OyqG2nSeXE3GUU8U3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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