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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec61b8fb38240246b7142b466bc2526a200fde6b002a94780367cea904fffd1' 
  AND token = 'joeOVIujCalH+NqkWlEEOgFxTh48iFgjrtw5nxB3ImM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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