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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2679eef8b507e4efbaf59ff62f33d531e3232db1757fff70128ff0835936af74' 
  AND token = 'EDQekrFWbtw7yMvTR1tKNJYI0Rl+QdJ6SbprX4WoJZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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