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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97cc9ba3c2e3aa1dda95fbcb21007345f4e86c767363062031001bbb96aab0d' 
  AND token = 'TtiArwW+E0h2GlYq3C3HBVvor/Yc8ml1tL+/vhzLolk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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