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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbddbb564d20a1ebb7a75973c535d4c99a3239833cc71fb17f299a4408544800' 
  AND token = 'UBeyAi5Jnq1lf5BKQ2ILhtu5WIrY20Rnby04VTnp2AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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