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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7ac4acff9dbc9898baa6b13759738c20f6bab728e7e6d5b3958b7b98212bbd' 
  AND token = '+v53UFSF9tfogJCgFjqRtuzuPrFE9dIbomdfZBpV2t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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