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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26b4872f0d5ccf5b5b763f89f082664090730189462ef5e8555207e2007e9ab' 
  AND token = '6XGoYM9lNHp3Zfe0THfkZqkblNVLbIlga7jp6Si9xro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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