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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b108d00d9fb9673b8bea46cb15d78e590553fe0e38be6d9f3da6423ad75c9d15' 
  AND token = 'K+WDJjpsuvmVtmFNNNc78kPUa7t58zI+1GXcYTLTXB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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