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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b332e75d083efb91453199927812dcd00080f3bd64c6cc3388d12920c41b4c49' 
  AND token = 'rSRFeC38usio7pnkhlZRARQZ1NzU65vbGUzOH1IvP20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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