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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cfa9a3b2dad6c8e66690464cfe7cd2b53c97a791d3f3ad4c6cb9e1bfd7ad3a' 
  AND token = 'g4IuKTv+a7gkcYz7yQ6gQmHCw7NG6U3Wv/2SUzzl+fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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