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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c377c31fab24b83be5b3295fae5111bf182d53973822c89c75494d14f36b9d' 
  AND token = 'DzO0hBSbZBWWZ2AAhhSN5ainNbPtE1g4yzcyk5KqQts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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