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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb1c88bdf4634fde82c32e6ac5ad34ac5232f1e2a63e6685091bce4c0461292' 
  AND token = 'tad2lHYpaJi8ebZfHQdW1nds8GK8bOPr8nhLxmGmvDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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