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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ac4938231dd05b844690125c678098b1acc47e70337a40d57f78e60a6b9a3c' 
  AND token = 'KOr0NN/LcHpRp37560mvIwxSl7hmOy0W8GaWrpz7mkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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