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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5c4229bce5644a32a8ed7821f8f43126f4334ede2cca106625aa7c0c7b601c' 
  AND token = 'Or92CPCO9MxyRbLVF7d7BpHr0a9dRA5RfABX29HK70M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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