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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df633b9316cffab648d0f5adf64e3e2da7e509c7856390a01d2bc1200c8b37d4' 
  AND token = 'bBSbCQJy4Y8T4IhgqsR+SwdbAo/bV/5VRpm3hkegnbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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