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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8243f5bbfc27fd448e0d6bc060113acdd0297b89b344439ba3bcf861176154f2' 
  AND token = 'vW4ixradC7g0wuWIi2U4L1tE9s3QdunYGLl7wDuhgcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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