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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2940f1befed65dd79de57a5317d391a5e39b27fe54917ae37fd06a75c3d0d602' 
  AND token = '2SKsftklT4D+Etv6LE6nZbqY0/Bm2oQm+dzdpA3gwW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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