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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7990e5e1a6df2ca73aa323d5fb0e095568a7716a09ceb0e35f7d0d8514ed504b' 
  AND token = '+agQuoQ7OfAicPkd85HWLQyn1jlIJk6YPqjIrwLJl28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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