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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40dc78867a8fcd92f9322d96e3e53fec9340fc0a975437bd696bf40aa50ce33' 
  AND token = '/lXjTuKAOi9hUT4Ztrpodmhi/8BE2/dag0lqOi1RQDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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