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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90209fddbd477855a56d01db7d6079b46698ed022f78ea066161a7a327b3bd61' 
  AND token = '2oRzT7UQGc7uZ+cAVd+BXuzJ61SkJbL9nt/RWxMCOeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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