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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0440a532f9862b829129ae98aeb9af0f9ed0e0e338aa1bbf739c9c2493f559' 
  AND token = 'YQA0pLpU1iDCjGDxFKTPb8rUArtk9THFe1qfigc/yCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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