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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d916bbb50f3b1709a7c297952c2950aab53749f5cfb89498a969c220271bf34' 
  AND token = 'XV/DkbuwPyXKWyzg8klSoKdy5b69dM0BOQjoSGFbtos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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