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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e68fcc57e371b925a890fb6a0ed2aa2ea5755312686cd08db45e9f5f195fb8' 
  AND token = 'tl9AFp9fhpdsPtRWLi/Wf0DeDV+7L1vZZ/w8mKa6hJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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