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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a1bbed9c3803819b1e409cac37252e44f3ce9bec512b8a2ca163e8a986e636' 
  AND token = 'oYrRb6uwy4hqnILMl2TtWuU59btj8hQE+ans5gAXuUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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