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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eba4f5fd501befbaf11a5e44084500843726b5c307ce03c700b40543118979' 
  AND token = 'BanjedAe0ZBG8txsP3dzokRH/j7LfpRl3zN5v7OmLfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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