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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9c3fd2b8193ad0a6291edf1f28746ffb2e0cd607688a4a094d413e71e73a0b' 
  AND token = 'MDEd8kAhI1HM27YSs46pg6eBK3hUEVgTS02xQv4Vv1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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