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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07455c28092c4a7d7dea7ee321f06ee44d0fa6508f81863c2d84b0095163af4' 
  AND token = 'JSEyznVdS1QhoXlgOu2cwfTp6wFCkhOxko01y1j+vsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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