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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b1f5b47a8b01a05a6a06d07eb8d63455a2db22608b123523eda0e7f7b0b356' 
  AND token = '7BZf9hVfmlvffetR2uUOG3qpmiPd5OwceAjjd/JAtxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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