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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76438ca06cafc71efb09e1ba155f09cd758b9691c6f40fb69ae95f56ea61308' 
  AND token = 'lP74lT/7Oerm4Fad6EIPpxjz2PhJ/mdFf95sTZ927Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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